diff --git a/package.json b/package.json
index 162529c0a..6ee664596 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "@angular/compiler": "12.2.16",
     "@babel/code-frame": "7.16.7",
     "@babel/parser": "7.17.0",
-    "@glimmer/syntax": "0.83.1",
+    "@glimmer/syntax": "0.84.0",
     "@iarna/toml": "2.2.5",
     "@typescript-eslint/typescript-estree": "5.11.0",
     "acorn": "8.7.0",
diff --git a/yarn.lock b/yarn.lock
index 1547d18be..48e95d108 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1221,6 +1221,13 @@
   dependencies:
     "@simple-dom/interface" "^1.4.0"
 
+"@glimmer/interfaces@0.84.0":
+  version "0.84.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.84.0.tgz#fa5cb7189910c853d473db19133d2180d813c0b7"
+  integrity sha512-+2clm2821gP+LiA4w1GOQtjgLDoqFOYVw3uwTvmzKGislR5lzC9s0la3W7NCqYwApv2aeZry4CJ6um6/Q46mYw==
+  dependencies:
+    "@simple-dom/interface" "^1.4.0"
+
 "@glimmer/reference@0.83.1":
   version "0.83.1"
   resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.83.1.tgz#0345b95431b5bb19843b308e6311d1ef81e36192"
@@ -1232,13 +1239,13 @@
     "@glimmer/util" "0.83.1"
     "@glimmer/validator" "0.83.1"
 
-"@glimmer/syntax@0.83.1":
-  version "0.83.1"
-  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.83.1.tgz#7e18dd445871c157ba0281f12a4fbf316fa49b41"
-  integrity sha512-n3vEd0GtjtgkOsd2gqkSimp8ecqq5KrHyana/s1XJZvVAPD5rMWT9WvAVWG8XAktns8BxjwLIUoj/vkOfA+eHg==
+"@glimmer/syntax@0.84.0":
+  version "0.84.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.84.0.tgz#bf5104fc2be7c853f1e3897dda16a655f6fd7d5f"
+  integrity sha512-TAo1vaO5SPWtstU3XOAeiG5izhlw2v2ASns7f5dwe0hzGPRHPGuatmsVCtw/CS6FH86weboLrOGz0KQwjMaKfQ==
   dependencies:
-    "@glimmer/interfaces" "0.83.1"
-    "@glimmer/util" "0.83.1"
+    "@glimmer/interfaces" "0.84.0"
+    "@glimmer/util" "0.84.0"
     "@handlebars/parser" "~2.0.0"
     simple-html-tokenizer "^0.5.11"
 
@@ -1251,6 +1258,15 @@
     "@glimmer/interfaces" "0.83.1"
     "@simple-dom/interface" "^1.4.0"
 
+"@glimmer/util@0.84.0":
+  version "0.84.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.84.0.tgz#a9d3a9471678e5c80470646a70ea54c2cf1f8e2c"
+  integrity sha512-H5OjZXaroV821TLVHXox4t2GICwUA8HdijyAf+wouSfINmm+y4GbbEwoZM9ns8YSZGX7/gG0Z4Znwti0oFbHPw==
+  dependencies:
+    "@glimmer/env" "0.1.7"
+    "@glimmer/interfaces" "0.84.0"
+    "@simple-dom/interface" "^1.4.0"
+
 "@glimmer/validator@0.83.1":
   version "0.83.1"
   resolved "https://registry.yarnpkg.com/@glimmer/validator/-/validator-0.83.1.tgz#7578cb2284f728c8e9302c51fc6e7660b570ac54"